package com.demo.utils;

import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


/**
 * 配置校验拦截器
 */
public class LoginInterceptor implements HandlerInterceptor  {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //TODO 判断是否需要拦截 ThreadLocal中是否有用户
        if (UserHolder.getUser() == null){
            //返回错误状态码
            response.setStatus(401);
            //拦截
            return false;
        }
       return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        UserHolder.removeUser();
    }
}
